Eastern South Dakota Radon Specialists

Sioux Falls Radon Solutions focuses on one thing: helping eastern South Dakota homeowners, businesses, and real estate professionals understand and address radon in their properties. Radon is the second-leading cause of lung cancer in the United States, and eastern South Dakota — particularly Minnehaha, Davison, Codington, Yankton, and Lincoln counties — sits in EPA Zone 1, where average radon predictions exceed the 4.0 pCi/L action level.

We provide residential radon testing, sub-slab depressurization mitigation systems, radon fan replacement for existing systems, transaction-ready real estate radon reports, and multi-point commercial testing. Every service we offer is grounded in how radon actually behaves in eastern South Dakota geology: glacial till over uranium-bearing shale formations, long sealed heating seasons that concentrate indoor radon, and the wide variation in levels that can exist even between neighboring homes.

Our service area covers the communities along I-90 and the James River corridor — Sioux Falls, Brookings, Mitchell, Watertown, Yankton, and the towns and rural properties between them. We know the geology, the housing stock, and the local real estate market. That local knowledge shapes how we approach each project.

5 Cities

Sioux Falls · Brookings · Mitchell · Watertown · Yankton

5 Services

Testing · Mitigation · Fan Replacement · Real Estate · Commercial

Zone 1

4 of 5 service counties in EPA's highest risk category

Homes & Business

Residential and commercial properties throughout eastern SD

Radon in Eastern South Dakota

Understanding the local geology and why it matters for your home or business.

Eastern South Dakota's radon risk comes from its geology. Glacial till — the unsorted mix of clay, sand, gravel, and rock left behind by retreating glaciers — covers most of the region. That till sits over uranium-bearing rock formations including Pierre Shale, Cretaceous sedimentary deposits, and Precambrian crystalline rock. As uranium decays, it produces radium, which in turn decays into radon gas. The radon migrates upward through the soil and enters buildings through foundation gaps, cracks, and utility penetrations.

The EPA's radon zone map designates four of our five primary service counties — Minnehaha, Davison, Codington, and Yankton — as Zone 1, meaning average predicted indoor radon above 4.0 pCi/L. Brookings County is Zone 2 (2–4 pCi/L average predicted), but many individual buildings there still test above the action level. The EPA action level applies to any individual building regardless of zone — the zones are county averages, not building-specific readings.

South Dakota's climate makes this worse. Long heating seasons — six or more months in much of eastern SD — mean homes and commercial buildings are sealed with tight pressure differentials for much of the year, which draws more radon in from below. Short-term test results taken during winter closed-building conditions often reflect a building's peak radon exposure period, which is why winter testing is often the most informative.

The good news: radon is a solvable problem. Sub-slab depressurization systems are highly effective and reliably lower radon levels in eastern SD homes. Testing and mitigation are straightforward services, and knowing your building's radon level is the first step.